<template>
    <div class="nav-bar" :class="{'is_fixed':isFixed}">
        <div class="container">
            <div class="pro-title">
                {{title}}
            </div>
            <div class="pro-param">
                <a href="javascript:;">概述</a><span>|</span>
                <a href="javascript:;">参数</a><span>|</span>
                <a href="javascript:;">用户评价</a>
                <slot name="buy"></slot>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        name: "ProductParam",
        props:{
            title:String,
        },
        data() {
            return{
                isFixed:false
            }
        },
        mounted() {
            window.addEventListener('scroll',this.initHeight)
        },
        methods:{
            initHeight() {
                let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
                this.isFixed = scrollTop > 152;  // NavHeader +  ProductParam
            }
        },
        destroyed() {
            window.removeEventListener('scroll',this.initHeight,false)
        }
    }
</script>

<style scoped lang="scss">
    @import "../assets/scss/base.scss";
    @import "../assets/scss/config.scss";
    @import "../assets/scss/mixin.scss";
    .nav-bar{
        height: 70px;
        line-height: 70px;
        border-top: 1px solid $colorH;
        background-color: $colorG;
        z-index: 10;
        // 吸顶
        &.is_fixed{
            position: fixed;
            top: 0;
            //box-shadow: 0 5px 5px $colorE;
        }
        .container{
            @include flex();
            .pro-title{
                font-size: $fontH;
                color: $colorB;
                font-weight: bold;
            }
            .pro-param{
                font-size: $fontJ;
                span{
                    margin: 0 10px;
                }
                a{
                    color: $colorC;
                }
                a:last-of-type{
                    margin-right: 10px;
                }
            }
        }
    }
</style>